The U.S.-led coalition battling ISIS has denied responsibility for the strikes.
Assad also said that Russia does not dictate his government's actions.
"He is no longer immune. His regime is no longer immune," the Israeli leader said.
Syrian President Bashar al-Assad said only "people that you trust, people who are level-headed, people who are thoughtful, people who are moral, ethical" must be listened to.
President Donald Trump called for Arab partners to contribute more to the fight against ISIS in Syria, but Saudi backing could further complicate the war.
The U.S. may reportedly dismantle its Al-Tanf base in exchange for a withdrawal of both pro-Assad and anti-Assad militias, leaving the Syrian army in control.
A New York Times report revealed the battle between the U.S.-led coalition and pro-Syrian government fighters in dramatic detail.
Israel first occupied Syria's Golan Heights during the 1967 Six-Day War and annexed it in 1981 without international recognition.
The Iranian military's chief of staff said America "is a disloyal, atrocious, criminal, isolated, angry enemy with disloyal, corrupt leaders."
Iran's Foreign Ministry said "No one can force Iran to do anything" and it would stay in Syria as long as it was welcome.
Putin said that a new political phase will follow "the significant victories and success of the Syrian army."
In his second known trip since 2011, Syrian President Bashar al-Assad told Russian President Vladimir Putin that "stability is improving."
Russian warships and submarines don't only target ISIS and other Syrian insurgents, but also provide a cover against NATO's southern flank in Europe.
China's envoy to Syria said he saw "huge space" to expand support for Russia and its role in Syria's seven-year civil war.
Hours after the Israeli military urged citizens to take shelter and President Donald Trump left the Iran deal, new strikes were reported in Syria.
An Israeli minister and Cabinet member said Syrian President Bashar al-Assad's continued support for Iran "will spell his end."
Engine trouble is currently believed to have caused the deadly crash at sea.
North Korea is an ally of Syria, Cuba and other fellow enemies of U.S. foreign policy, but peace may be on the horizon.
As the Syrian military and its allies advance on the ISIS' last stronghold south of Damascus, the jihadis' tactics grow more bloody.
Syrian military positions in southern Hama were reportedly attacked as international tensions mounted.
Syrians must return home and prove property ownership by May 11.
The U.S.-led coalition and the axis of Russia, Iran and Syria both claim Iraq as an ally—and Baghdad may be the key to bringing them together.
Moscow has repeatedly hinted it could send some of its most advanced air defense systems to Syria.
ISIS has agreed to surrender its final stronghold south of Damascus, but the Syrian military and allies continue to fight until talks are finalized.
Foreign Minister Sergei Lavrov said Moscow warned the Americans of its "red lines."